Octopuses may be dreaming when they change colour in their sleep

Researchers filming sleeping octopuses saw bursts of skin patterns flicker across their bodies during an active sleep phase, much like the displays they use while awake.

Crows remember faces, and they hold grudges

Researchers who trapped crows while wearing a specific mask were scolded by the local flock for years afterward, even by birds that were never caught.

The largest living thing might be a fungus in Oregon

A honey fungus in the Malheur National Forest spreads underground across nearly ten square kilometres and may be thousands of years old.

Why cats knock things off tables

Researchers think it is part hunting instinct, part attention seeking. Your mug was never safe.

Ball lightning still puzzles physicists

Glowing orbs that float through rooms have been reported for centuries and reproduced only briefly in labs.

Sea turtles navigate using Earth’s magnetic field

Hatchlings seem to carry a magnetic map of the coastline they were born on.